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#!/bin/bash
# tzwatch
# Displays the time in a number of time zones, specified by the user.
# The list of time zones (format as TZ variable) is kept in ${HOME}/.tzlist
# The time zone is chosen using tzselect
# (Debian default is /usr/bin/tzselect, in package libc6).
# ( ${HOME}/.tzlist could be edited by hand, with a valid value for the TZ variable on each line)
# Command line options:
# -c, configure time zones (add or remove)
# -f FORMAT display time according to FORMAT (see 'date' command)
# If no command line options are given, the time in each zone at the
# given moment is printed.
# Things that could be done:
# Possibly this would be better done in perl. Too bad.
# A window-graphics display could be nice too.
# Add an option -r [n] to run continuously (display updated every n seconds)
# This program is considered copyrighted and distributable under the terms of the GPL, which I will not bother copying here.
# Drew Parsons <dparsons@debian.org>
# Version 1.2.3 14 July 2002
# only refer to timezone label for existing zones when configuring
# Version 1.2.2, 20 Jan 2002
# change "timezone" to "time zone". tzselect is now in package libc6.
# Version 1.2.1, May 2000
# made recognition of timezone "Local" case-insensitive
# Version 1.2, March 2000
# configfile renamed to .tzlist (for compatibility with gworldclock), 'local' zone added
# Version 1.1, [2] January 2000 (should that be 1.0.1 ?? )
# tzselect gone missing in potato. Located in slink's timezones package.
# Version 1.0, 29 November 1999
# Original version
# default config file
TZWATCH=${HOME}/.tzlist
if [ "$1" == "--help" ]; then
echo "Usage: tzwatch [-c] [-f FORMAT]"
echo " -c configure time zones (add or remove)"
echo " -f FORMAT display time according to FORMAT (see 'date' command)"
exit 0;
fi
# set config file if not yet done
if [ ! -s $TZWATCH ]; then
if [ `type -p tzselect` ]; then
tzselect > $TZWATCH
else
echo tzselect not found. Cannot configure tzwatch.
exit 1
fi
fi
while getopts "cf:" OPT; do
case $OPT in
c) # configure: add or remove entry
choice=
while [ "$choice" != "Done" ]; do
echo Choose zone to remove or add new zone:
select choice in \
`awk '// {print $1}' $TZWATCH` 'Add Zone' 'Add Local Time' 'Done'
do
case $choice in
'')
echo 'Please enter a number in range.';;
'Add Zone')
if [ `type -p tzselect` ]; then
tzselect >> $TZWATCH
else
echo tzselect not found. Cannot add time zone.
fi
# there ought to something we can do here to make sure the zone has not been already be chosen, sort lines and removes duplicates or whatever
echo
break;;
'Add Local Time')
if [ `type -p tzselect` ]; then
echo Local >> $TZWATCH
else
echo tzselect not found. Cannot add local time.
fi
break;;
'Done')
break;;
?*)
#swapping '/' in zone name to '\/' for sed. I can't believe how many darn \\\\\'s you need!
debarredzone=`echo $choice | sed 's|/|\\\/|'`
sed -e "\|$debarredzone|d" $TZWATCH | cat > $TZWATCH
break;;
esac
done
done;;
f) #format string for date output
DATEFORMAT=$OPTARG
# if the given format has no leading +, then add one
if [ -z "$(echo $DATEFORMAT |
sed "{s/^[\'\"]//g; s/[\'\"]$//g}" | # strip surrounding quotemarks
awk /^\\+/)" ]; then # check for leading +
DATEFORMAT=+$DATEFORMAT
fi;;
?*)
echo Usage: tzwatch [-c] [-f FORMAT]
echo -e "Try \`tzwatch --help' for more information."
exit 0;;
esac
done
##################################################################3
# finally, display times
# zdump could be used here, but then '-f' formatting would be lost.
# Not that I use date formatting, but it's the principle of the matter.
# wc always prints file name. How annoying. awk it away.
NZ=`wc -l $TZWATCH | awk '{print $1}'`
n=1
until [ $(( $n )) -gt $(( $NZ )) ]; do
#grab zone from config file
zoneRaw=`awk -v nn=$n 'NR==nn { print $1}' $TZWATCH`
# allow "local" time zone to be in any case, "Local" or "local" or whatever
zone=`echo $zoneRaw | sed s/local/Local/I`
# Create time string.
# Sorry about the doubled date calls, it was the only way I could
# get the format string handled correctly (without providing a default
# format string myself in the case where the user does not give one)
if [ -z "$DATEFORMAT" ]; then
if [ "x$zone" == "xLocal" ]; then
TZdate=$(LANG=C date)
else
TZdate=$(LANG=C TZ="$zone" date)
fi
else
if [ "x$zone" == "xLocal" ]; then
TZdate=$(LANG=C date "$DATEFORMAT")
else
TZdate=$(LANG=C TZ="$zone" date "$DATEFORMAT")
fi
fi
# and display
# I'd want the zone on the left, but then the date strings would be misaligned
echo "$TZdate $zone"
# why doesn't '+=' work for incrementing n, like in C?
n=$(( $n + 1 ))
done
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